<td>
  <ul class="admin_show_list">
  <?php foreach ($current as $item): ?>
    <li>
      <?php echo $item->__toString() ?>
    </li>
  <?php endforeach ?>
  </ul>
</td>
<td>
  <ul class="admin_show_list">
  <?php foreach ($previous as $item): ?>
    <li>
      <?php echo $item->__toString() ?>
    </li>
  <?php endforeach ?>
  </ul>
</td>